I'm getting better at testing my water. The only test I can't quite nail down is the cya. Sometimes I can see that black dot, sometimes I think I can. Thats why I went to the pool place to see how much cya I have. I think their test is way off. The best I can come up with on my cya is 30-40? They said 6. I told them that imposible. The last time they checked it they said it was 43 and that was a few weeks ago. Now I know Chlorine gets used up, but cya stays put right?. They said their reading could be false. Whats up with that? I tested my chlorine before I left and it was 5 ppm. They said it was 1.9. Maybe that could be because the FC in my pool cleaned the new ziplock freezer bag on the way to the pool place? As Jason said sometimes happens. They said my Alkalinity was 80. I will buy that. Ph was 7.7. I got 7.5 with mine. I feel bad for the poor saps that bring their water to these places and and think they are acurate. I do wish I could know my CYA levels better. So I could know what FC to shoot for. And what the true shock level is. I just shocked my pool sunday night. I put 1 and a 1/2 gallons of 12.5 % shock. I test my Chlorine every day. Usually with the DPD powder, so I can also check for CC. The only thing thats a little hard is just how much is a heaping spoonfull with that tiny spoon. Filix.